Brendo, it sounds like you need the gut punch (disco fever) mod Ian made for Slim and I. By my crude measurements, it will give you a 6dB boost between 55 and 85 Hz.
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A-LFR/1000-8 & 2/500v4x2
1000-3,1500-3
100,160,QS10x2,800,M5x2,M2/3/50v4
had v2;v4 FOC rock
Nx maybe